路面随机不平度下车辆对路面的动载特性

采用快速傅立叶逆变换法对路面随机不平度进行时域模拟,建立二分之一车辆动力学模型,应用龙格-库塔法分析了路面等级、车速、载质量和车辆参数对路面动载荷的影响,研究了车辆产生的动载荷规律。仿真结果表明:车辆动载随着路面不平度的增大而明显增大;车辆动载和动载系数随着车速的提高而增大,且在固有频率附近会出现峰值;载质量的增加虽导致动载系数降低,但动载增大,故应严格限制超载现象;增大轮胎刚度和减小悬架阻尼都会引起车辆动载与动载系数的增大,因此,应限制高压轮胎的使用和选择合理的车辆阻尼参数。

Vehicle dynamic load property resulted from road random roughness

Road random roughness was simulated by using inverse fast Fourier transform(IFFT) in time domain,a half-vehicle dynamics model was established,the effects of road grade,vehicle velocity,loading capacity and vehicle parameters on vehicle dynamic load were studied by Runge-Kutta method,and the rules of vehicle dynamic load caused by road roughness were studied.Simulation result indicates that vehicle dynamic load increases obviously with the intensification of road roughness;vehicle dynamic load and the dynamic load coefficient increase with the increase of vehicle speed,their peak values appear nearby inherent frequency;dynamic load coefficient decreases and vehicle dynamic load increases with the increase of loading capacity,so overload phenomena is strictly limited;increasing tire stiffness and decreasing suspension damping can lead to the increase of vehicle dynamic load and dynamic load coefficient,so the use of high pressure tire should be limited and the selection of suspension damping should be reasonable.12 figs,9 refs.